From 2b5b3c8ca233d13fd4757e6e88ac60cfd00653ac Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Tue, 11 Jun 2024 20:14:18 -0400 Subject: kernel: Add sys/atomic.h Signed-off-by: Ian Moffett --- sys/include/sys/atomic.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 sys/include/sys/atomic.h (limited to 'sys') diff --git a/sys/include/sys/atomic.h b/sys/include/sys/atomic.h new file mode 100644 index 0000000..1e60ac7 --- /dev/null +++ b/sys/include/sys/atomic.h @@ -0,0 +1,65 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _SYS_ATOMIC_H_ +#define _SYS_ATOMIC_H_ + +static inline unsigned long +atomic_add_long_nv(volatile unsigned long *p, unsigned long v) +{ + return __sync_add_and_fetch(p, v); +} + +static inline unsigned int +atomic_add_int_nv(volatile unsigned int *p, unsigned int v) +{ + return __sync_add_and_fetch(p, v); +} + +static inline unsigned long +atomic_sub_long_nv(volatile unsigned long *p, unsigned long v) +{ + return __sync_sub_and_fetch(p, v); +} + +static inline unsigned int +atomic_sub_int_nv(volatile unsigned int *p, unsigned int v) +{ + return __sync_sub_and_fetch(p, v); +} + +/* Atomic increment (and fetch) operations */ +#define atoimc_inc_long(P) atomic_add_long_nv((P), 1) +#define atomic_inc_int(P) atomic_add_int_nv((P), 1) + +/* Atomic decrement (and fetch) operations */ +#define atomic_dec_long(P) atomic_sub_long_nv((P), 1) +#define atomic_dec_int(P) atomic_sub_int_nv((P), 1) + +#endif /* !_SYS_ATOMIC_H_ */ -- cgit v1.2.3